Thermal decomposition of jarosites of potassium, sodium and lead

Frost, Ray L., Weier, Matt L., & Martens, Wayde N. (2005) Thermal decomposition of jarosites of potassium, sodium and lead. Journal of Thermal Analysis and Calorimetry, 82(1), pp. 115-118.

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Jarosites are a group of minerals formed in evaporite deposits and form a component of efflorescence. As such the minerals can function as cation and heavy metal collectors. Thermogravimetry coupled to mass spectrometry has been used to study three Australian jarosites which are predominantly K, Na and Pb jarosites. Mass loss steps of K jarosite occur over the 130 to 330 and 500 to 622 degrees Celsius temperature range and are attributed to dehydroxylation and desulphation. In contrast the behaviour of the thermal decomposition of Na-jarosite shows three mass loss steps at 215 to 230, 316 to 352 and 555 to 595 degrees Celsius. The first mass loss step for Na-jarosite is attributed to deprotonation. For Pb-jarosite two mass loss steps associated with dehydroxylation are observed at 390 and 418 degrees Celsius and a third mass loss step at 531 degrees Celsius is attributed to the loss of SO3. Thermal analysis is an excellent technique for the study of jarosites. The analysis depends heavily on the actual composition of the jarosite.

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ID Code: 2149
Item Type: Journal Article
Refereed: Yes
Additional Information: This paper is one of a series of papers on jarosites and alunites. Such minerals have been identified on Mars.
Keywords: jarosite, dehydration, dehydroxylation, Raman spectroscopy, high, resolution thermogravimetric analysis
DOI: 10.1007/s10973-005-0850-z
ISSN: 1572-8943
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Springer
Copyright Statement: The original publication is available at SpringerLink
Deposited On: 05 Oct 2005 00:00
Last Modified: 29 Feb 2012 13:15

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